package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;
    /*
     * 统计指定时间区间内的营业额数据
     * */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date对应的营业额，状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            HashMap map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover ==null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }


        String join = StringUtils.join(dateList, ",");

        return TurnoverReportVO
                    .builder()
                    .dateList(join)
                    .turnoverList(StringUtils.join(turnoverList,","))
                    .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天新增用户数量
        ArrayList<Integer> newUserList = new ArrayList<>();
        //存放每天总用户数量
        ArrayList<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            HashMap map = new HashMap();

            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        ArrayList<Integer> totalOrderList = new ArrayList<>();
        ArrayList<Integer> validOrderList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的订单总数
            Integer totalOrderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            totalOrderList.add(totalOrderCount);
            validOrderList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = totalOrderList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单量
        Integer validOrderCount = validOrderList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate =0.0;
        if(totalOrderCount != 0){

            orderCompletionRate =  validOrderCount.doubleValue() / totalOrderCount.doubleValue();
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(totalOrderList,","))
                .validOrderCountList(StringUtils.join(validOrderList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    /*
    * 销量统计
    * */

    @Override
    public SalesTop10ReportVO getSalesTop10Statistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO.builder().nameList(nameList).numberList(numberList).build();
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,Integer status) {
        HashMap map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    public void exportBusinessData(HttpServletResponse response){
        //查询数据库，获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        LocalDateTime begin = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(dateEnd, LocalTime.MAX);//locaDate转为LocalDateTime
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);
        //通过POI将数据写入Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        //基于模板文件创建新的excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //填充数据
            XSSFSheet sheet1 = excel.getSheet("Sheet1");
            sheet1.getRow(1).getCell(1).setCellValue("时间是："+dateBegin+"至"+dateEnd);
            XSSFRow row = sheet1.getRow(3);//第4行
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            XSSFRow row1 = sheet1.getRow(4);//第5行
            row1.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row1.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);

                //查询某一天
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                XSSFRow row2 = sheet1.getRow(7 + i);
                row2.getCell(1).setCellValue(date.toString());
                row2.getCell(2).setCellValue(businessData.getTurnover());
                row2.getCell(3).setCellValue(businessData.getValidOrderCount());
                row2.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row2.getCell(5).setCellValue(businessData.getUnitPrice());
                row2.getCell(6).setCellValue(businessData.getNewUsers());
            }


            //通过数据流将Excel文件下载到客户端浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);

            outputStream.close();
            excel.close();


        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
